Programming Languages Chapter 4 Car Display Total Expenses Cout

An Introduction to Programming with C++: Eighth Edition

Chapter 4 Answers

Review Questions

1. b cout << “Pay rate per hour? “;

2. a cin >> payRate;

3. d none of the above

4. b answer = num1 + num1 / num2;

Exercises – Pencil and Paper

1. The answer to this TRY THIS Exercise is located at the end of Chapter 4 in the book.

IPO chart information

Input

food

rent

utilities

car payment (253.75)

Processing

none

Algorithm:

1. enter food, rent, and utilities

C++ instructions

double food = 0.0;

double rent = 0.0;

double utilities = 0.0;

const double CAR = 253.75;

double totalExpenses = 0.0;

cout << “Food: “;

cin >> food;

cout << “Rent: “;

cin >> rent;

4. The missing lines are shaded.

IPO chart information

Input

quantity

total cost

Algorithm:

1. enter the quantity and total cost

C++ instructions

int quantity = 0;

double total = 0.0;

cout << “Quantity: “;

cin >> quantity;

cout << “Total cost: “;

cin >> total;

5. The missing lines are shaded.

IPO chart information

Input

quantity sold

Output

profit

Algorithm:

1. enter the quantity sold, item cost,

and item selling price

C++ instructions

int quantity = 0;

double profit = 0.0;

cout << “Quantity sold: “;

cin >> quantity;

cout << “Item cost: “;

cin >> cost;

cout << “Item selling price: “;

6. The missing lines are shaded.

IPO chart information

Input

number of pets

number of owners

Algorithm:

1. enter number of pets and number

of owners

C++ instructions

int pets = 0;

int owners = 0;

cout << “Number of pets: “;

cin >> pets;

cout << “Number of owners: “;

cin >> owners;

7. Seven of the corrections are shaded. The eighth correction is the removal of the semicolon that appears at

the end of the #include <iostream> instruction in Figure 4-34.

#include <iostream>

using namespace std;

int main()

{

int quantity = 0;

Exercises – Computer

8. The answer to this TRY THIS Exercise is located at the end of Chapter 4 in the book. The code is entered

in the TryThis8.cpp file, which is contained in either the Cpp8\Chap04\TryThis8 Project-IM folder

(Microsoft) or the Cpp8\Chap04 folder (non-Microsoft).

11. See the Introductory11.cpp file, which is contained in either the Cpp8\Chap04\Introductory11 Project-IM

folder (Microsoft) or the Cpp8\Chap04 folder (non-Microsoft).

a. and first part of c.

IPO chart information

Input

Processing

none

Output

ending balance

Algorithm:

1. enter beginning balance, total

deposits, and total withdrawals

C++ instructions

double beginning = 0.0;

double ending = 0.0;

cout << “Beginning balance: “;

cin >> beginning;

cout << “Total deposits: “;

cin >> deposits;

b.

beginning balance total deposits total withdrawals ending balance

2545.75 409.43 210.65 2744.53

1125.33 23.0 800.94 347.39

c. (second part)

beginning deposits withdrawals ending

0.0 0.0 0.0 0.0

12. See the Introductory12.cpp file, which is contained in either the Cpp8\Chap04\Introductory12 Project-IM

folder (Microsoft) or the Cpp8\Chap04 folder (non-Microsoft).

a. and first part of c.

IPO chart information

Input

length

Output

gallons

Algorithm:

1. enter length, width, and height

C++ instructions

double length = 0.0;

double gallons = 0.0;

cout << “Length: “;

cin >> length;

cout << “Width: “;

b.

inches in a gallon length width height gallons

231 20.5 10.5 12.5 11.6477

231 30 9 14 16.3636

c. (second part)

INCH_IN_GAL length width height gallons

231.0 0.0 0.0 0.0 0.0

13. See the Intermediate13.cpp file, which is contained in either the Cpp8\Chap04\Intermediate13 Project-IM

folder (Microsoft) or the Cpp8\Chap04 folder (non-Microsoft).

a. and first part of c.

IPO chart information

Input

length in feet

Processing

area in square feet

Output

total cost

Algorithm:

1. enter length in feet, width in feet, and

price per square foot

C++ instructions

double length = 0.0;

double area = 0.0;

double totalCost = 0.0;

cout << “Length (feet): “;

cin >> length;

b. The test data will vary.

length in feet width in feet price per square foot area in square feet total cost

10 12 5.25 120 630

8 10 4 80 320

c. (second part) The test data will vary.

length width priceSqFt area totalCost

0.0 0.0 0.0 0.0 0.0

14. See the Intermediate14.cpp file, which is contained in either the Cpp8\Chap04\Intermediate14 Project-IM

folder (Microsoft) or the Cpp8\Chap04 folder (non-Microsoft).

a. and first part of c.

IPO chart information

Input

small

medium

large

family

Processing

none

Output

total sold

Algorithm:

1. enter small, medium, large, and family

2. calculate total sold by adding together

small, medium, large, and family

3. calculate small percentage by dividing

small by total sold and then multiplying

the result by 100

6. calculate family percentage by dividing

family by total sold and then multiplying

the result by 100

7. display total sold, small percentage,

C++ instructions

int small = 0;

int medium = 0;

int large = 0;

int family = 0;

int totalSold = 0;

cout << “Small pizzas: “;

cin >> small;

totalSold = small + medium + large +

family;

smallPercent =

static_cast<double>(small) / totalSold *

static_cast<double>(large) / totalSold *

100;

familyPercent =

cout << “Large percentage: ” <<

largePercent << “%” << endl;

cout << “Family percentage: ” <<

familyPercent << “%” << endl;

b.

small medium large family total sold

small percentage medium percentage large percentage family percentage

12.5 25.0 25.0 37.5

c. (second part)

small medium large family totalSold

0 0 0 0 0

smallPercent medPercent largePercent familyPercent

0.0 0.0 0.0 0.0

15. See the Advanced15.cpp file, which is contained in either the Cpp8\Chap04\Advanced15 Project-IM folder

(Microsoft) or the Cpp8\Chap04 folder (non-Microsoft).

a. and first part of c.

IPO chart information

Input

individual fee (99)

dual fee (175)

Processing

individual revenue

dual revenue

family revenue

Output

total revenue

Algorithm:

1. enter individual memberships, dual

memberships, and family memberships

2. calculate individual revenue by

multiplying individual memberships

by individual fee

6. calculate individual percentage by

dividing individual revenue by total

revenue and then multiplying the

result by 100

C++ instructions

const int INDIVIDUAL_FEE = 99;

const int DUAL_FEE = 175;

int individualRev = 0;

int dualRev = 0;

int familyRev = 0;

int totalRev = 0;

cout << “Individual memberships: “;

cin >> individual;

cout << “Dual memberships: “;

cin >> dual;

cout << “Family memberships: “;

cin >> family;

individualRev = individual *

INDIVIDUAL_FEE;

individualPercent =

static_cast<double>(individualRev) /

totalRev * 100;

revenue and then multiplying the

result by 100

9. display total revenue, individual

cout << endl << “Total revenue: $” <<

b.

individual fee dual fee family fee individual memberships dual memberships

99 175 225 50 75

family memberships individual revenue dual revenue family revenue total revenue

150 4950 13125 33750 51825

265 3465 26250 59625 89340

individual percentage dual percentage family percentage

c. (second part)

INDIVIDUAL_FEE DUAL_FEE FAMILY_FEE individual dual

99 175 225 0 0

50 75

99 175 225 0 0

35 150

family individualRev dualRev familyRev totalRev

0 0 0 0 0

individualPercent dualPercent familyPercent

0.0 0.0 0.0

16. See the Advanced16.cpp file, which is contained in either the Cpp8\Chap04\Advanced16 Project-IM folder

(Microsoft) or the Cpp8\Chap04 folder (non-Microsoft). The total appears as $504.00 rather than $504.01

17. See the SwatTheBugs17.cpp file, which is contained in either the Cpp8\Chap04\SwatTheBugs17 Project-

IM folder (Microsoft) or the Cpp8\Chap04 folder (non-Microsoft). To debug the program, change the

temp =+ 1.5; statement to either temp += 1.5; or temp = temp + 1.5;.